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ggml-cpu: add DELTA_NET backend + tests

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UPSTREAM PR #18102: ggml-cuda: Delta-Net linear attention for Qwen3-Next #593

ggml-cpu: add DELTA_NET backend + tests
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LOCI Review / Performance Review #593 succeeded Dec 16, 2025 in 36m 35s

Performance varied across binaries, overall acceptable

2 binaries improved · 13 binaries unchanged · 1 binary stable ~ within threshold · 0 binaries degraded ~ beyond threshold

Binary Δ % Response Δ % Throughput Performance (based on response time)
build.bin.libggml-base.so -0.29 0.11 improved
build.bin.libggml-cpu.so 0.18 0.27 stable
build.bin.libggml.so 0 0 unchanged
build.bin.libllama.so -0.34 0.06 improved
build.bin.libmtmd.so 0 0 unchanged
build.bin.llama-bench 0 0 unchanged
build.bin.llama-cvector-generator 0 0 unchanged
build.bin.llama-gemma3-cli 0 0 unchanged
build.bin.llama-gguf-split 0 0 unchanged
build.bin.llama-llava-cli 0 0 unchanged
build.bin.llama-minicpmv-cli 0 0 unchanged
build.bin.llama-quantize 0 0 unchanged
build.bin.llama-qwen2vl-cli 0 0 unchanged
build.bin.llama-run 0 0 unchanged
build.bin.llama-tokenize 0 0 unchanged
build.bin.llama-tts 0 0 unchanged

Performance threshold: 30%
Default configuration used.
Note: Performance status is evaluated only from Δ% Response. Throughput is displayed for reference.

Explore the complete analysis inside the Version Insights.